Lab tests CPT 84520 Outpatient

BUN test cost in Whitewater, WI

In Whitewater-Elkhorn, WI, 2 hospitals list a cash price for blood urea nitrogen (BUN) test: from $22.50 to $73.16, with a median of $47.83. The lowest listed price is at Aurora Lakeland Medical Center — $25.33 less than the median here. Across Wisconsin, the median is $25.74 at 94 hospitals.

Cash prices at 2 facilities across 2 cities for code 84520, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Nov 21, 2025 and Mar 1, 2026.

Lowest$22.50Aurora Lakeland Medical Center

Median$47.83half of hospitals charge less

Highest$73.16in this market

Difference3.3×highest vs lowest

Where each hospital's price falls

Each dot is one hospital's cash price on a scale from the lowest to the highest in Whitewater-Elkhorn, WI.

median

Lowest $22.50Highest $73.16

Hospitals, cheapest first

Hospital	Cash price	List price	Insurers pay	Off list
Aurora Lakeland Medical Center lowest Elkhorn, WI · (262) 741-2000 POC NITROGEN SERUM File of Nov 21, 2025 · source file	$22.50	$45.00	$3.16–$38.25	50%
Aurora Lakeland Medical Center Elkhorn, WI · (262) 741-2000 BUN File of Nov 21, 2025 · source file	$27.50	$55.00	$3.16–$46.75	50%
Mercyhealth Hospital & Medical Center - Walworth Lake Geneva, WI · (262) 245-0535 CHG ASSAY OF UREA NITROGEN QUANTITATIVE File of Mar 1, 2026 · source file	$73.16	$97.55	—	25%

Hospital The hospital that published the price, its city and the line exactly as written in its price file.

Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More

List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More

Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More

Off list How much lower the cash price is than the list price.

Outpatient: lowest $22.50, median $47.83, highest $73.16 — a 3.3× difference within the same market.

As an inpatient, the same code is billed by 2 facilities here, median $47.83. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.

Cash or insurance?

At the one hospital here that publishes insurer rates for this code, the cash price is below the highest rate a health plan has negotiated. If you have insurance but have not met your deductible, you usually pay your plan's negotiated rate, which falls somewhere in the "Insurers pay" column. Paying cash can cost less, but a cash payment usually does not count toward your deductible. Ask the hospital for both numbers before you book.

What it is

A BUN test measures urea nitrogen, a waste product removed by the kidneys. It is used with creatinine to check kidney function and hydration.

What the price covers

The price usually covers running the test. The blood draw (36415) is often billed as a separate line.